The forum is worldwide the rule of the game is worldwide and the rules of the forum are also worldwide right?
But I can have accounts in the game in several communities right?
I can only have one account in the correct forum?
Can this forum account be used to ask questions in any community I play?
Only one account per user, can probably be used in any section you can manage yourself. I see no point for teamlers to go digging for info on whether you actually play on some language or not based on the forum section . But say if you didn't speak Greek, spamming the Greek section with a different language would probably be a no-go.
As for the languages, those are there so that anyone can post bugs that they find in their native tongue, without having to use Google Translate or whatever which can very often completely destroy the original post. It is up to the language section admin/go/mod, sometimes the language's CoMa to forward it and reply to you, and I can definitely say that bugs (more broadly put, "issues with servers") aren't always worldwide.
I hope nobody will punish me for backseat modding .